IBM PS/1 - 386 SX 25 MHz (72-Pin Memory SIMM) System Board Layout

386SX 25MHz (72-Pin Memory SIMM) System Board
Layout
B2 Battery
J1 72-Pin Memory SIMM Bank 1
J2 72-Pin Memory SIMM Bank 0
J3 Video Feature
J4 Display/Signal
J5 Parallel Port
J6 Riser
J7 Serial Port
J8 Password Bypass
J9 Mouse
J10 Keyboard
J11 Hard Disk
J12 Beeper Bypass
J13 Pins 1 and 2—Power On LED
Pins 3 and 4—Hard Disk LED
J14 Diskette
J15 Power
U10 386SX Processor
U20 BIOS
U23 Math Coprocessor
U5 512K X 9 System Memory
U6 512K X 9 System Memory
U8 512K X 9 System Memory
U9 512K X 9 System Memory
U32 256K X 4 Video Memory
U33 256K X 4 Video Memory
Parts/Test Point Locations
5-3